Imported existing code

libraries/include/boost/interprocess/sync/interprocess_recursive_mutex.hpp

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+//////////////////////////////////////////////////////////////////////////////
+//
+// (C) Copyright Ion Gaztanaga 2005-2008. Distributed under the Boost
+// Software License, Version 1.0. (See accompanying file
+// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+// See http://www.boost.org/libs/interprocess for documentation.
+//
+//////////////////////////////////////////////////////////////////////////////
+//
+// Parts of the pthread code come from Boost Threads code:
+//
+//////////////////////////////////////////////////////////////////////////////
+//
+// Copyright (C) 2001-2003
+// William E. Kempf
+//
+// Permission to use, copy, modify, distribute and sell this software
+// and its documentation for any purpose is hereby granted without fee,
+// provided that the above copyright notice appear in all copies and
+// that both that copyright notice and this permission notice appear
+// in supporting documentation.  William E. Kempf makes no representations
+// about the suitability of this software for any purpose.
+// It is provided "as is" without express or implied warranty.
+//////////////////////////////////////////////////////////////////////////////
+
+#ifndef BOOST_INTERPROCESS_RECURSIVE_MUTEX_HPP
+#define BOOST_INTERPROCESS_RECURSIVE_MUTEX_HPP
+
+/// @cond
+
+#if (defined _MSC_VER) && (_MSC_VER >= 1200)
+#  pragma once
+#endif
+
+#include <boost/interprocess/detail/config_begin.hpp>
+#include <boost/interprocess/detail/workaround.hpp>
+#include <boost/interprocess/detail/posix_time_types_wrk.hpp>
+#include <cassert>
+
+#if !defined(BOOST_INTERPROCESS_FORCE_GENERIC_EMULATION) && \
+   (defined(BOOST_INTERPROCESS_POSIX_PROCESS_SHARED) && defined (BOOST_INTERPROCESS_POSIX_RECURSIVE_MUTEXES))
+   #include <pthread.h>
+   #include <errno.h>   
+   #include <boost/interprocess/sync/posix/pthread_helpers.hpp>
+   #define BOOST_INTERPROCESS_USE_POSIX
+#else
+   #include <boost/interprocess/detail/atomic.hpp>
+   #include <boost/cstdint.hpp>
+   #include <boost/interprocess/detail/os_thread_functions.hpp>
+   #include <boost/interprocess/sync/interprocess_mutex.hpp>
+   #define BOOST_INTERPROCESS_USE_GENERIC_EMULATION
+#endif
+
+/// @endcond
+
+//!\file
+//!Describes interprocess_recursive_mutex and shared_recursive_try_mutex classes
+
+namespace boost {
+
+namespace interprocess {
+
+//!Wraps a interprocess_mutex that can be placed in shared memory and can be 
+//!shared between processes. Allows several locking calls by the same 
+//!process. Allows timed lock tries
+class interprocess_recursive_mutex
+{
+   /// @cond
+   //Non-copyable
+   interprocess_recursive_mutex(const interprocess_recursive_mutex &);
+   interprocess_recursive_mutex &operator=(const interprocess_recursive_mutex &);
+   /// @endcond
+   public:
+   //!Constructor.
+   //!Throws interprocess_exception on error.
+   interprocess_recursive_mutex();
+
+   //!Destructor. If any process uses the mutex after the destructor is called
+   //!the result is undefined. Does not throw.
+  ~interprocess_recursive_mutex();
+
+   //!Effects: The calling thread tries to obtain ownership of the mutex, and
+   //!   if another thread has ownership of the mutex, it waits until it can
+   //!   obtain the ownership. If a thread takes ownership of the mutex the
+   //!   mutex must be unlocked by the same mutex. The mutex must be unlocked
+   //!   the same number of times it is locked.
+   //!Throws: interprocess_exception on error.
+   void lock(void);
+
+   //!Tries to lock the interprocess_mutex, returns false when interprocess_mutex 
+   //!is already locked, returns true when success. The mutex must be unlocked
+   //!the same number of times it is locked.
+   //!Throws: interprocess_exception if a severe error is found
+   bool try_lock(void);
+
+   //!Tries to lock the interprocess_mutex, if interprocess_mutex can't be locked before
+   //!abs_time time, returns false. The mutex must be unlocked
+   //!   the same number of times it is locked.
+   //!Throws: interprocess_exception if a severe error is found
+   bool timed_lock(const boost::posix_time::ptime &abs_time);
+
+   //!Effects: The calling thread releases the exclusive ownership of the mutex.
+   //!   If the mutex supports recursive locking, the mutex must be unlocked the
+   //!   same number of times it is locked.
+   //!Throws: interprocess_exception on error.
+   void unlock(void);
+   /// @cond
+   private:
+   #if defined (BOOST_INTERPROCESS_USE_GENERIC_EMULATION)
+   interprocess_mutex                  m_mutex;
+   unsigned int                        m_nLockCount;
+   volatile detail::OS_systemwide_thread_id_t   m_nOwner;
+   #else    //#if defined (BOOST_INTERPROCESS_USE_GENERIC_EMULATION)
+   pthread_mutex_t m_mut;
+   #endif   //#if (defined BOOST_INTERPROCESS_WINDOWS)
+   /// @endcond
+};
+
+}  //namespace interprocess {
+
+}  //namespace boost {
+
+#ifdef BOOST_INTERPROCESS_USE_GENERIC_EMULATION
+#  undef BOOST_INTERPROCESS_USE_GENERIC_EMULATION
+#  include <boost/interprocess/sync/emulation/interprocess_recursive_mutex.hpp>
+#endif
+
+#ifdef BOOST_INTERPROCESS_USE_POSIX
+#  undef BOOST_INTERPROCESS_USE_POSIX
+#  include <boost/interprocess/sync/posix/interprocess_recursive_mutex.hpp>
+#endif
+
+#include <boost/interprocess/detail/config_end.hpp>
+
+#endif   //BOOST_INTERPROCESS_RECURSIVE_MUTEX_HPP